Rival challenge mode:
Complete the game in championship mode as any character to unlock rival challenge mode.

Black Diamond track:
Win championship mode as any character to unlock the Black Diamond track.

Easy points for secret characters:
Find a large ramp to do tricks off. Do a trick, then turn around and do it again. You can take as long as needed to build the points. Then, finish the race to unlock the secret character. This can be done on any track that you still need points for a secret character.

Losing sleds in rival challenge mode:
Do not challenge a rival on a track that you cannot win. If you challenge a rival and lose to him or her, the sled you used will be lost and have to be unlocked in championship mode again.

Sergei:
Enter the options screen, select the load/save option, and display the password screen. Then, enter Square, L1, Square, L2, Triangle, R2, X, Circle as a password. Note: This character is named Rhine Rider in the PAL version of the game.

Soundtrack:
Place the game disc in an audio CD player and play tracks two and above.

More traction when landing:
Hold the throttle and brake simultaneously when landing a jump to get more traction. This should allow you to pull away from the CPU riders a little quicker. This saved time can add up at the end of the race.

Bonus points:
Run over the rabbits that appear on the track to get 7500 points. Run through the snowmen to get 100 points. Destroy signs to get 50 points.

Find the bear:
Go to Kodiak Canyon to get onto the bear platform. Ride up the part of the wall where the snow makes a ramp, then you can ride up to the bear.

Find the coyote:
When you get to the Hard Pack level, you will find a big ramp. As you go up it, you will see a coyote howling. Immediately turn left in the middle of the ramp and follow the path going up to the bridge, then make a hard right. You will see a coyote and you can drive right up to it.